The following steps helped me for magento site speed optimization First, be sure to use all types of caching available, including Varnish Cache. Second, set up a Content Delivery Network (CDN) to speed up loading of static files. The extensions from Amasty were very useful - their performance optimization tools significantly improved the situation on my site. I also recommend enabling GZIP compression and setting up HTTP/2 to improve download speed. Check your code for unnecessary scripts and styles that can slow things down. Hope these tips help!